Intelligent Maintenance and Low Pollution Electrophoretic Coating Equipment for Complex Workpieces with Coverage

Equipment Description:

I. Control system

1. DC power supply

Parameters: 50-300V adjustable, ripple factor <5% (silicon rectifier/thyristor technology).

Mode: constant voltage/constant current switching to meet the coating requirements of different workpieces.

2. Automatic monitoring

Sensor: real-time monitoring of conductivity (tank liquid <1000μS/cm, anode liquid needs to be diluted regularly).

PLC integration: linkage adjustment of temperature, flow, and voltage parameters.

II. Technical features

Efficient coverage: electric field drives coating deposition, complex workpiece cavity coverage >95%.

Low pollution: ultrafiltration system recovery rate >90%, VOC emissions reduced by 80%.

Intelligent maintenance: automatically trigger backwashing program to extend the life of membrane components.

III. Maintenance points

1. Anode liquid management: regular detection of conductivity (<1000μS/cm), check the integrity of the diaphragm when turbid. ‌2. Circulation system maintenance‌: Clean the filter bag monthly to prevent blockage and flow rate drop.
‌3. Tank liquid parameter monitoring‌: Test pH value (5.8-6.5) and Fe²⁺ concentration (<20ppm) weekly.

Main structures and components:

I. Structural composition

1. Main tank

Function: The core area of electrophoretic coating, used to hold electrophoretic liquid and complete the electro-deposition process.

Material: PP/PVC or epoxy fiberglass lined anti-corrosion tank (large tank uses steel plate + anti-corrosion lining).

Design features: The shape is rectangular or boat-shaped, and the bottom adopts parabolic/arc surface transition to reduce the dead corner of precipitation.
The volume is designed according to the workpiece size and production requirements, generally 10-50m³.

2. Overflow tank

Function: Control the liquid level height of the main tank, recover overflow paint and discharge surface foam.

Structure: Conical bottom design, connected to the main tank through a circulation pipe to prevent precipitation accumulation.

3. Auxiliary tank (spare tank)

Purpose: Temporary storage of tank liquid, used for main tank maintenance, cleaning or emergency drainage.

‌II. Core components‌
‌1. Electrode device‌
‌Anode system‌: Titanium metal electrode covered with semi-permeable membrane (such as canvas material), allowing H⁺ to pass but blocking resin particles.
Anode liquid circulates independently, and the conductivity is regularly tested and pure water is added for dilution.
‌Cathode arrangement‌: The workpiece is connected to the DC power supply as the cathode, and the inter-electrode spacing is adjusted according to the uniformity of the electric field.
‌2. Circulation filtration system‌
‌Circulation pump‌: Flow rate 6-8 times/hour to ensure uniform composition and temperature of the tank liquid.
‌Filter device‌: Coarse filter (50μm filter bag) intercepts foreign matter;
Precision filter (metal mesh/fiber cylinder) removes dust particles.
‌3. Temperature control unit‌
‌Heat exchanger‌: Plate or tube heat exchanger, maintaining the tank liquid temperature at 20-30℃ (±1℃).
‌Temperature control medium‌: Cold water (7-10℃) is used for cooling, and warm water (40-45℃) is used for heating. ‌4. Ultrafiltration system (UF system)‌
‌Function‌: Recover floating paint, control impurity ion concentration, and provide cleaning liquid (UF liquid conductivity <50μS/cm).
‌Components‌: Rolled/tubular ultrafiltration membrane (pore size 0.001-0.1μm), backwash pump and circulation pipeline.

‌III. Other auxiliary components‌
‌Power supply system‌: DC rectifier (50-300V adjustable), supporting constant voltage/constant current mode switching.
‌Conveying device‌: Suspension chain or conveyor belt, used for moving workpieces in continuous production lines.
‌Ventilation device‌: Exhaust gases (such as O₂) generated by electrolysis to avoid oxidation of the tank liquid.

Features:

1.High cost performance: Based on the customer's product positioning and development strategy, and with economic affordability as the foundation, we achieve the best cost performance.
2.The advanced and meticulous design concept of the equipment, along with the highly automated industrial equipment, showcases the image of a modern and advanced enterprise.
3. It has high adaptability, meeting the current production requirements and reserving room for development, taking into account the needs of increased production and improved quality in the future.
4.Quality compliance strictly adheres to the ISO900 quality management system, with every minute detail of the entire equipment installation being strictly controlled.